{"id":3754,"date":"2020-05-25T08:35:00","date_gmt":"2020-05-25T06:35:00","guid":{"rendered":"https:\/\/www.nerdiy.de\/?p=3754"},"modified":"2020-05-25T08:46:36","modified_gmt":"2020-05-25T06:46:36","slug":"codefragmenten-arduino-i2c-enable-broadcast-ontvangst","status":"publish","type":"post","link":"https:\/\/nerdiy.de\/nl\/codefragmenten-arduino-i2c-enable-broadcast-ontvangst\/","title":{"rendered":"Codefragment: Arduino - schakel I2C-uitzendontvangst in"},"content":{"rendered":"<p>I2C is het busprotocol of de technologie waarmee een microcontroller met veel sensoren of actuatoren kan communiceren. Dankzij de juiste software kun je bovendien verschillende microcontrollers met elkaar verbinden en communiceren. Per I2C-bus is er doorgaans maar \u00e9\u00e9n master die via het bijbehorende adres data kan opvragen of versturen naar een slave.<\/p>\n<p>In een van mijn projecten wilde of wil ik meerdere microcontrollers met elkaar verbinden. Hiervoor zijn verschillende bustechnologie\u00ebn geschikt. I2C is echter vrijwel de enige die rechtstreeks wordt ondersteund door vrijwel elke moderne microcontroller zonder aanvullende hardwarevereisten. De keuze viel dus al snel op I2C.<\/p>\n<p>Met behulp van I2C werden of zijn nu meerdere microcontrollers met elkaar verbonden. De master kan eenvoudig een commando naar elke individuele slave sturen. Om dit te doen, stuurt u eenvoudigweg het slave-adres en het gewenste commando over de bus. Alle slaves luisteren naar wat er op de bus gebeurt, maar alleen de slave met het bijbehorende adres reageert op het verzonden commando. Tot nu toe gaat het goed.<\/p>\n<p>Maar wat als de master een commando naar alle slaves wil sturen? Om bijvoorbeeld een commando synchroon op alle slaves te starten? Als er twee of drie slaven zijn, kunt u toch elke slaaf afzonderlijk informeren. De verwerkingssnelheid is meestal zo snel dat u geen groot tijdsverschil merkt tussen uitvoeringen op de individuele slaves. Als u deze procedure echter met 100 slaves gebruikt, zult u snel merken dat de laatst aangemelde slave aanzienlijk later start dan de eerste slave.<\/p>\n<p>De oplossing voor dit probleem is het I2C-broadcastadres. Dit is een adres waar elke slaaf op de bus naar luistert. Om dit te activeren hoeft u alleen maar een controlebit in te stellen. Zo werkt het tenminste met Arduino&#039;s op basis van Atmel-processors. \ud83d\ude42<\/p>\n<p>Hoe je dit bit kunt instellen, wordt beschreven in het volgende artikel.<\/p>\n<hr \/>\n<h2>Schakel I2C-broadcast in voor I2C-slaves<\/h2>\n<p>Damit alle Teilnehmer auf dem I2C-Bus pauschal benachrichtigt werden k\u00f6nnen, gibt es die Broadcast-Adresse &#8222;0&#8220;. Die Null ist also fest definiert als die Adresse f\u00fcr Broadcast-Nachrichten und sollte auch von keinem anderen Slave genutzt werden.<\/p>\n<p>Standardm\u00e4\u00dfig reagiert ein Mikrocontroller aber nicht auf diese Adresse. Dies muss erst aktiviert werden indem Ihr das entsprechende Kontroll-Bit setzt. Dazu m\u00fcsst Ihr lediglich folgende Zeile in die &#8222;setup()&#8220; Funktion Eures Programmcodes einf\u00fcgen.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">TWAR = (adres &lt;&lt; 1) | 1; \/\/ luister naar uitgezonden berichten inschakelen<\/pre>\n<p>In een volledige I2C-initialisatiefunctie zou het er bijvoorbeeld zo uit kunnen zien<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">leegte init_i2c() { Wire.begin(adres); TWAR = (adres &lt;&lt; 1) | 1; \/\/ luisteren naar uitgezonden berichten inschakelen Wire.onReceive(i2c_receive_event); Serial.print(F(&quot;I2C: I2C-slave ge\u00efnitialiseerd op adres: &quot;)); Serial.println(adres); }<\/pre>\n<hr \/>\n<h2>Algemene informatie over I2C en interrupts<\/h2>\n<p>Ein Ereignis auf dem I2C-Bus ruft immer einen Interrupt auf, welcher den regul\u00e4ren Ablauf Eures Mikrocontrollers unterbricht. Die Programmausf\u00fchrung h\u00fcpft also kurz aus dem Ablauf des regul\u00e4ren Programms in die Interrupt-Routine. Den Aufenthalt darin solltet Ihr aber so kurz wie m\u00f6glich halten. Deswegen ist es &#8222;g\u00e4ngige Praxis&#8220; innerhalb der Interrupt-Routine eine &#8222;Flag&#8220; zu setzen. Diese &#8222;Flag&#8220; ist eigentlich nur eine Boolsche Variable, welche dort auf &#8222;true&#8220; gesetzt wird. Zur\u00fcck in dem Haupt-Programmablauf Eures Mikrocontrollers k\u00f6nnt Ihr nun regelm\u00e4\u00dfig pr\u00fcfen ob diese Variable gesetzt ist.<\/p>\n<p>Als dat zo is, kunt u nu de ontvangen gegevens of opdrachten lezen en overeenkomstig reageren.<\/p>\n<p>\u00dcbrigens: Ihr solltet innerhalb der Interrupt-Routinen auch keine &#8222;Serial.print&#8230;&#8220; oder \u00e4hnliche Zeit-fressenden Befehle nutzen.<\/p>\n<hr \/>\n<h2>Meer informatie<\/h2>\n<p><a href=\"http:\/\/forum.arduino.cc\/index.php?topic=183699.0\"><em><strong>http:\/\/forum.arduino.cc\/index.php?topic=183699.0<\/strong><\/em><\/a><\/p>\n<p><a href=\"http:\/\/www.gammon.com.au\/i2c\"><em><strong>http:\/\/www.gammon.com.au\/i2c<\/strong><\/em><\/a><\/p>\n<p><a href=\"http:\/\/www.gammon.com.au\/forum\/?id=10896&amp;reply=1#reply1\"><em><strong>http:\/\/www.gammon.com.au\/forum\/?id=10896&amp;reply=1#reply1<\/strong><\/em><\/a><\/p>\n<hr \/>\n<h2>Veel plezier met het project<\/h2>\r\n<p>Ik hoop dat alles werkte zoals beschreven. Zo niet, of als je vragen of suggesties hebt, laat het me weten in de commentaren. Ik zal dit dan zo nodig aan het artikel toevoegen.<br \/>Idee\u00ebn voor nieuwe projecten zijn altijd welkom. \ud83d\ude42<\/p>\r\n<p><strong>PS Veel van deze projecten - vooral de hardwareprojecten - kosten veel tijd en geld. Natuurlijk doe ik dit omdat ik het leuk vind, maar als je het cool vindt dat ik de informatie met je deel, dan zou ik blij zijn met een kleine donatie aan het koffiefonds. \ud83d\ude42<\/strong><\/p>\r\n<p><a href=\"https:\/\/ko-fi.com\/nerdiy\" target=\"_blank\" rel=\"noopener\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" style=\"border: 0px; height: 36px;\" src=\"https:\/\/i0.wp.com\/cdn.ko-fi.com\/cdn\/kofi4.png?resize=143%2C36&#038;ssl=1\" alt=\"Koop Me a Coffee op ko-fi.com\" width=\"143\" height=\"36\" border=\"0\" \/><\/a>\u00a0 \u00a0 \u00a0 \u00a0<input name=\"cmd\" type=\"hidden\" value=\"_s-xclick\" \/> <input name=\"hosted_button_id\" type=\"hidden\" value=\"UAZE9RMHJY7VJ\" \/> <input title=\"PayPal - De veiligere, gemakkelijkere manier om online te betalen!\" alt=\"Donate with PayPal button\" name=\"submit\" src=\"https:\/\/www.paypalobjects.com\/de_DE\/DE\/i\/btn\/btn_donateCC_LG.gif\" type=\"image\" \/> <img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.paypal.com\/de_DE\/i\/scr\/pixel.gif?resize=1%2C1&#038;ssl=1\" alt=\"\" width=\"1\" height=\"1\" border=\"0\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>I2C is het busprotocol of de technologie waarmee een microcontroller kan communiceren met vele sensoren of actuatoren. Dankzij de juiste software kun je ook verschillende microcontrollers aan elkaar koppelen en [\u2026]<\/p>","protected":false},"author":1,"featured_media":8502,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[56,66,86],"tags":[29,73,60,156],"class_list":["post-3754","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-codeschnipsel","category-elektronik","tag-arduino","tag-arduino-nano","tag-codeschnipsel","tag-i2c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Codeschnipsel: Arduino - I2C-Broadcast empfang aktivieren - nerdiy.de - DIY, Elektronik, 3D Druck und mehr...<\/title>\n<meta name=\"description\" content=\"Read a huge collection of detailed Tutorials on Nerdiy.de about all kind of Software, Hardware and general maker topics.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nerdiy.de\/nl\/codefragmenten-arduino-i2c-enable-broadcast-ontvangst\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Codeschnipsel: Arduino - I2C-Broadcast empfang aktivieren - nerdiy.de - DIY, Elektronik, 3D Druck und mehr...\" \/>\n<meta property=\"og:description\" content=\"Read a huge collection of detailed Tutorials on Nerdiy.de about all kind of Software, Hardware and general maker topics.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nerdiy.de\/nl\/codefragmenten-arduino-i2c-enable-broadcast-ontvangst\/\" \/>\n<meta property=\"og:site_name\" content=\"nerdiy.de - DIY, Elektronik, 3D Druck und mehr...\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/nerdiy.de\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/nerdiy.de\/\" \/>\n<meta property=\"article:published_time\" content=\"2020-05-25T06:35:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-05-25T06:46:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2020\/05\/www.nerdiy.de-decodeschnipsel-arduino-i2c-broadcast-empfang-aktivierenencode-snippet-arduino-activate-i2c-broadcast-reception-sharex-lmhk6d6iyx.png?fit=746%2C271&ssl=1\" \/>\n\t<meta property=\"og:image:width\" content=\"746\" \/>\n\t<meta property=\"og:image:height\" content=\"271\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Fab\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@nerdiyde\" \/>\n<meta name=\"twitter:site\" content=\"@nerdiyde\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Fab\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/nerdiy.de\\\/de_de\\\/codeschnipsel-arduino-i2c-broadcast-empfang-aktivieren\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nerdiy.de\\\/de_de\\\/codeschnipsel-arduino-i2c-broadcast-empfang-aktivieren\\\/\"},\"author\":{\"name\":\"Fab\",\"@id\":\"https:\\\/\\\/nerdiy.de\\\/de_de\\\/#\\\/schema\\\/person\\\/f1579a71868adb0be60a74246d3e0908\"},\"headline\":\"Codeschnipsel: Arduino &#8211; 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Die meisten Sensoren und Aktoren im Smart-Home Bereich setzen dabei neben W-Lan und Bluetooth auf\u2026","rel":"","context":"In &quot;Abendprojekt(&lt;2h)&quot;","block_context":{"text":"Abendprojekt(&lt;2h)","link":"https:\/\/nerdiy.de\/nl\/categorie\/avond-project2u\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/02\/20171107_160724-1-scaled.jpg?fit=1200%2C900&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/02\/20171107_160724-1-scaled.jpg?fit=1200%2C900&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/02\/20171107_160724-1-scaled.jpg?fit=1200%2C900&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/02\/20171107_160724-1-scaled.jpg?fit=1200%2C900&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/02\/20171107_160724-1-scaled.jpg?fit=1200%2C900&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":2083,"url":"https:\/\/nerdiy.de\/nl\/evalueren-howto-raspberry-pi-mpr121-touchsensor-via-i2c-and-node-red\/","url_meta":{"origin":3754,"position":3},"title":"HowTo: Raspberry Pi - MPR121 aanraaksensor evalueren via I2C en Node Red","author":"Fab","date":"2. July 2022","format":false,"excerpt":"Dank des I2C Bus kann der Raspberry Pi mit vielerlei praktischen Sensoren und Aktoren ausgestattet werden. Eine (meiner Meinung nach) sehr elegante M\u00f6glichkeit f\u00fcr Benutzereingaben bietet dabei der MPR121. Der MPR121 ist ein Controller, der es erm\u00f6glicht bis zu 12 Touch-Elektroden auszuwerten. Ihr k\u00f6nnt damit also bis zu 12 Elektroden\u2026","rel":"","context":"In &quot;Abendprojekt(&lt;2h)&quot;","block_context":{"text":"Abendprojekt(&lt;2h)","link":"https:\/\/nerdiy.de\/nl\/categorie\/avond-project2u\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2020\/12\/www.nerdiy.de-howto-elektronik-mpr121-an-raspberrypi-esp32-esp8266-und-co-anschliessen-fritzing-tnihiv4t95-1.jpg?fit=962%2C752&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2020\/12\/www.nerdiy.de-howto-elektronik-mpr121-an-raspberrypi-esp32-esp8266-und-co-anschliessen-fritzing-tnihiv4t95-1.jpg?fit=962%2C752&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2020\/12\/www.nerdiy.de-howto-elektronik-mpr121-an-raspberrypi-esp32-esp8266-und-co-anschliessen-fritzing-tnihiv4t95-1.jpg?fit=962%2C752&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2020\/12\/www.nerdiy.de-howto-elektronik-mpr121-an-raspberrypi-esp32-esp8266-und-co-anschliessen-fritzing-tnihiv4t95-1.jpg?fit=962%2C752&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":617,"url":"https:\/\/nerdiy.de\/nl\/fibonacci-klok-programmeren\/","url_meta":{"origin":3754,"position":4},"title":"HowTo: Fibonacci-klok - Programmeren","author":"Fab","date":"29. May 2018","format":false,"excerpt":"In den beiden Beitr\u00e4gen FibonacciUhr - Ein ungew\u00f6hnlicher Zeitanzeiger und FibonacciUhr - Zusammenbau wurde die FibonacciUhr vorgestellt und beschrieben wie ihr eine eigene FibonacciUhr zusammenbauen k\u00f6nnt. Nachdem ihr den Zusammenbau abgeschlossen habt steht nun noch die Programmierung der Uhr an. Dies ist im folgendem Artikel beschrieben. Voraussetzungen Zur Programmierung eurer\u2026","rel":"","context":"In &quot;Abendprojekt(&lt;2h)&quot;","block_context":{"text":"Abendprojekt(&lt;2h)","link":"https:\/\/nerdiy.de\/nl\/categorie\/avond-project2u\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/05\/InkedScreenshot-152_LI.jpg?fit=1048%2C590&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/05\/InkedScreenshot-152_LI.jpg?fit=1048%2C590&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/05\/InkedScreenshot-152_LI.jpg?fit=1048%2C590&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/05\/InkedScreenshot-152_LI.jpg?fit=1048%2C590&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":1697,"url":"https:\/\/nerdiy.de\/nl\/tasmota-ws2812-lichtketting-om-zelf-te-bouwen\/","url_meta":{"origin":3754,"position":5},"title":"HowTo: Tasmota \u2013 WS2812 lichtketting om zelf te bouwen","author":"Fab","date":"27. 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Das tolle bei den WS2812B-LED's ist, dass man die Farbe und Helligkeit jeder einzelnen LED steuern\u2026","rel":"","context":"In &quot;3D-Druck&quot;","block_context":{"text":"3D-Druck","link":"https:\/\/nerdiy.de\/nl\/categorie\/3d-printen\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/10\/www.nerdiy.de-tasmota-ws2812-lichterkette-zum-selber-bauen-20181002-183208.jpg?fit=1200%2C900&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/10\/www.nerdiy.de-tasmota-ws2812-lichterkette-zum-selber-bauen-20181002-183208.jpg?fit=1200%2C900&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/10\/www.nerdiy.de-tasmota-ws2812-lichterkette-zum-selber-bauen-20181002-183208.jpg?fit=1200%2C900&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/10\/www.nerdiy.de-tasmota-ws2812-lichterkette-zum-selber-bauen-20181002-183208.jpg?fit=1200%2C900&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/10\/www.nerdiy.de-tasmota-ws2812-lichterkette-zum-selber-bauen-20181002-183208.jpg?fit=1200%2C900&ssl=1&resize=1050%2C600 3x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/nerdiy.de\/nl\/wp-json\/wp\/v2\/posts\/3754","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nerdiy.de\/nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nerdiy.de\/nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nerdiy.de\/nl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nerdiy.de\/nl\/wp-json\/wp\/v2\/comments?post=3754"}],"version-history":[{"count":0,"href":"https:\/\/nerdiy.de\/nl\/wp-json\/wp\/v2\/posts\/3754\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nerdiy.de\/nl\/wp-json\/wp\/v2\/media\/8502"}],"wp:attachment":[{"href":"https:\/\/nerdiy.de\/nl\/wp-json\/wp\/v2\/media?parent=3754"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nerdiy.de\/nl\/wp-json\/wp\/v2\/categories?post=3754"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nerdiy.de\/nl\/wp-json\/wp\/v2\/tags?post=3754"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}